JSON test binary

app.go

package main

import (
        "encoding/json"
        "fmt"
        "io/ioutil"
        "os"
)

func main() {

        data, err := ioutil.ReadAll(os.Stdin)
        if err != nil {
                fmt.Fprintln(os.Stderr, err)
                os.Exit(1)
        }

        var out interface{}
        if err := json.Unmarshal(data, &out); err != nil {
                fmt.Fprintln(os.Stderr, err)
                os.Exit(1)
        }

        data, err = json.MarshalIndent(out, "", "    ")
        if err != nil {
                fmt.Fprintln(os.Stderr, err)
                os.Exit(1)
        }

        fmt.Println(string(data))
}